Toggle Main Menu Toggle Search

Open Access padlockePrints

Simulation of Edge Cracks Using Pulsed Eddy Current Stimulated Thermography

Lookup NU author(s): Professor Gui Yun TianORCiD, John Wilson


Full text for this publication is not currently held within this repository. Alternative links are provided below where available.


Thermography has proven to be one of the most effective approaches to detect cracks in conductive specimens over a relatively large area. Pulsed eddy current stimulated thermography is an emerging integrative nondestructive approach for the detection and characterization of surface and subsurface cracks. In this paper, heating behaviors of edge cracks, excited by pulsed eddy currents, are examined using numerical simulations. The simulations are performed using COMSOL multiphysics finite element method simulation software using the AC/DC module. The simulation results show that in the early heating stage, the temperature increases more quickly at the crack tip compared with other points on the sample. The results indicate that to maximize sensitivity, the response should be analyzed in the early stages of the heating period, no more than 100 ms for samples in which we are interested. The eddy current density distribution is changed with a variation in inductor orientation, but the crack tips remain the "hottest" points during the excitation period, which can be used for robust quantitative defect evaluation. Signal feature selection, transient temperature profile of the sample, and influence of the inductor orientation on the detection sensitivity for edge cracks are investigated. The work shows that positioning of the inductor, perpendicular to the crack line, results in the highest sensitivity for defect detection and characterization. The crack orientation can be estimated through the rotation of the linear inductor near the sample edge and the crack tips. [DOI:10.1115/1.4002710]

Publication metadata

Author(s): Yang SX, Tian GY, Abidin IZ, Wilson J

Publication type: Article

Publication status: Published

Journal: Journal of Dynamic Systems, Measurement and Control

Year: 2011

Volume: 133

Issue: 1

Print publication date: 30/11/2010

ISSN (print): 0022-0434

ISSN (electronic): 1528-9028

Publisher: ASME International


DOI: 10.1115/1.4002710


Altmetrics provided by Altmetric